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Earnings Per Share (Tables) | 12 Months Ended
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May 31, 2018
Earnings Per Share [Abstract] |
Reconciliation of Numerator and Denominator of Basic and Diluted Earnings Per Share | The following table sets forth the reconciliation of the numerator and denominator of basic and diluted earnings per share for the years ended May 31, 2018, 2017 and 2016:
Year Ended May 31, |  | 2018 |  |  | 2017 |  |  | 2016 |
(In thousands, except per share amounts) |  |  |  |  |  |  |  |  |  |  |  |
Numerator for earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to RPM International Inc. stockholders |  | $ | 337,770 |  |  | $ | 181,823 |  |  | $ | 354,725 |
Less: Allocation of earnings and dividends to participating securities |  |  | (3,858 | ) |  |  | (2,795 | ) |  |  | (5,770 | )
Net income available to common shareholders - basic |  |  | 333,912 |  |  |  | 179,028 |  |  |  | 348,955 |
Add: Undistributed earnings reallocated to unvested shareholders |  |  |  |  |  |  | 2 |  |  |  |  |
Reverse: Allocation of earnings and dividends to participating securities |  |  | 3,858 |  |  |  |  |  |  |  | 5,770 |
Add: Income effect of contingently issuable shares |  |  | 5,673 |  |  |  | 5,457 |  |  |  | 5,430 |
Net income available to common shareholders - diluted |  | $ | 343,443 |  |  | $ | 184,487 |  |  | $ | 360,155 |
Denominator for basic and diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic weighted average common shares (1) |  |  | 131,179 |  |  |  | 130,662 |  |  |  | 129,383 |
Average diluted options |  |  | 2,064 |  |  |  | 598 |  |  |  | 3,445 |
Net issuable common share equivalents (2) |  |  | 3,928 |  |  |  | 3,905 |  |  |  | 3,888 |
Total shares for diluted earnings per share (1), (3) |  |  | 137,171 |  |  |  | 135,165 |  |  |  | 136,716 |
Earnings Per Share of Common Stock Attributable to |  |  |  |  |  |  |  |  |  |  |  |
RPM International Inc. Stockholders: |  |  |  |  |  |  |  |  |  |  |  |
Basic Earnings Per Share of Common Stock |  | $ | 2.55 |  |  | $ | 1.37 |  |  | $ | 2.70 |
Diluted Earnings Per Share of Common Stock |  | $ | 2.50 |  |  | $ | 1.36 |  |  | $ | 2.63 |
(1) | Basic and diluted earnings per share are calculated using the two-class method for the year ended May 31, 2017. For the years ended May 31, 2018 and 2016, basic and diluted earnings per share are calculated under the two-class method and the treasury method, respectively, as those methods resulted in the most dilutive earnings per share.
(2) | Represents the number of shares that would be issued if our contingently convertible notes were converted. We include these shares in the calculation of diluted EPS as the conversion of the notes may be settled, at our election, in cash, shares of our common stock, or a combination of cash and shares of our common stock.
(3) | For the years ended May 31, 2018 and 2017, approximately 799,362 and 606,048 shares of stock, respectively, granted under stock-based compensation plans were excluded from the calculation of diluted EPS, as the effect would have been anti-dilutive.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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